exam Maths Puzzle Numerical Ability

I cannot figure out how to rewrite this logarithm as one simplified logarithm

log(6x)+5log(3x)-3log(9x)

Please help.

xandra

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exam Other Question

Please help.

Solve the following system by substitution.

8x - 4y = 16
y = 2x -4

Thanks
JMS Solve the system of linear equations by the substitution method.

y = -4/3x

4x + 2y = 3/4